package com.xl.utils.util;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import lombok.extern.slf4j.Slf4j;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.net.URL;
import java.util.Hashtable;

/**
 * @Author xionglin
 * @Classname QRCodeUtil
 * @Description 生成二维码工具
 * @Date 2019/9/19 11:30
 */
@Slf4j
public class QRCodeUtil {

    /**
     * 编码
     */
    private static final String CHARSET = "utf-8";

    /**
     * 图片格式
     */
    private static final String IMAGE_FORMAT_JPG = "JPG";

    /**
     * 图片格式
     */
    private static final String IMAGE_FORMAT_PNG = "PNG";

    /**
     * 二维码尺寸
     */
    private static final int QR_CODE_SIZE = 300;

    /**
     * LOGO宽度
     */
    private static final int WIDTH = 60;

    /**
     * LOGO高度
     */
    private static final int HEIGHT = 60;

    /**
     * 二维码颜色
     */
    private static final int BLACK = 0xFF000000;

    /**
     * 二维码颜色
     */
    private static final int WHITE = 0xFFFFFFFF;

    /**
     * 生产图片
     * @param content 内容
     * @param imgPath logo的图片地址
     * @param needCompress 是否需要压缩logo图片
     * @return
     * @throws Exception
     */
    private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QR_CODE_SIZE, QR_CODE_SIZE,
                hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, bitMatrix.get(x, y) ? BLACK : WHITE);
            }
        }
        if (imgPath == null || "".equals(imgPath)) {
            return image;
        }
        // 插入图片
        QRCodeUtil.insertImage(image, imgPath, needCompress);
        return image;
    }

    private static Image getImage(String imgPath) throws Exception{
        File file = new File(imgPath);
        Image src;
        if (!file.exists()) {
            //log.error(imgPath + " 该文件不存在!");
            //网络图片
            src = ImageIO.read(new URL(imgPath));
        }else{
            //本地图片
            src = ImageIO.read(new File(imgPath));
        }
        return src;
    }

    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
        Image src = getImage(imgPath);
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        // 压缩LOGO
        if (needCompress) {
            if (width > WIDTH) {
                width = WIDTH;
            }
            if (height > HEIGHT) {
                height = HEIGHT;
            }
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            // 绘制缩小后的图
            g.drawImage(image, 0, 0, null);
            g.dispose();
            src = image;
        }
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QR_CODE_SIZE - width) / 2;
        int y = (QR_CODE_SIZE - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

    public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
        mkdirs(destPath);
        ImageIO.write(image, IMAGE_FORMAT_JPG, new File(destPath));
    }

    public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
        return image;
    }

    public static void mkdirs(String destPath) {
        File file = new File(destPath);
        // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs();
        }
    }

    public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
            throws Exception {
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
        ImageIO.write(image, IMAGE_FORMAT_JPG, output);
    }

    public static void encode(String content, OutputStream output) throws Exception {
        QRCodeUtil.encode(content, null, output, false);
    }


    /**
     * 私有化构成器避免工具类被实例化
     */
    private QRCodeUtil(){}
}
